Effects:
Alters the stream positions within one or more of
the controlled sequences in a way that is defined separately for each class
derived from
basic_­streambuf
in this Clause ([stringbuf.virtuals],
[filebuf.virtuals]).

Effects:
Alters the stream positions within one or more of
the controlled sequences in a way that is defined separately for each class
derived from
basic_­streambuf
in this Clause ([stringbuf],
[filebuf]).